materio-d8/web/themes/custom/matminimal/matminimal.theme

<?php

/**
 * @file
 * Functions to support theming in the Seven theme.
 */

use Drupal\Core\Form\FormStateInterface;


/**
 * Implements hook_preprocess_HOOK() for HTML document templates.
 */
// function matminimal_preprocess_html(&$variables) {
//   // If on a node add or edit page, add a node-layout class.
//   $path_args = explode('/', \Drupal::request()->getPathInfo());
//   if ($suggestions = theme_get_suggestions($path_args, 'page', '-')) {
//     foreach ($suggestions as $suggestion) {
//       // dsm($suggestion);
//       preg_match('/taxonomy-manage-[^-]+-add$/', $suggestion, $matches);
//       // ksm($matches);
//       if ($suggestion === 'page--taxonomy-term-edit' || isset($matches)) {
//         $variables['attributes']['class'][] = 'node-form-layout';
//       }
//     }
//   }
// }

// function matminimal_form_alter(&$form, FormStateInterface $form_state, $form_id){
//   // dsm($form_id);
//   // create a colomuned term form (not working yet)
//   if(in_array($form_id, ['taxonomy_term_company_form', 'taxonomy_term_showroom_form'])){
//     // ksm($form);
//     $form['#theme'] = ['term_edit_form'];
//     $form['#attached']['library'][] = 'seven/node-form';
// 
//     $form['advanced']['#type'] = 'container';
//     $form['meta']['#type'] = 'container';
//     $form['meta']['#access'] = TRUE;
//     $form['meta']['changed']['#wrapper_attributes']['class'][] = 'container-inline';
//     $form['meta']['author']['#wrapper_attributes']['class'][] = 'container-inline';
// 
//     $form['revision_information']['#type'] = 'container';
//     $form['revision_information']['#group'] = 'meta';
//   }
// }

/**
 * Implements hook_form_BASE_FORM_ID_alter() for \Drupal\node\NodeForm.
 *
 * Changes vertical tabs to container.
 */
function matminimal_form_node_form_alter(&$form, FormStateInterface $form_state) {
  $form['#theme'] = ['node_edit_form'];
  $form['#attached']['library'][] = 'seven/node-form';

  $form['advanced']['#type'] = 'container';
  $form['meta']['#type'] = 'container';
  $form['meta']['#access'] = TRUE;
  $form['meta']['changed']['#wrapper_attributes']['class'][] = 'container-inline';
  $form['meta']['author']['#wrapper_attributes']['class'][] = 'container-inline';

  $form['revision_information']['#type'] = 'container';
  $form['revision_information']['#group'] = 'meta';
}